Deacreasing the resolution will not make the camera focus more on quality, it will just give you a smaller image with less data. To get the highest-quality photos, shoot in RAW with the highest resolution possible, and practice perfecting them in Photoshop.

I mean I could see it if you were to go out on a shoot, and then shot that combo just in case you messed anything up. Then upon returning, keeping the JPEGs you like, then editing the raws you need to tweak, and then getting rid of everything else.